Are you replacing all of the parts save the block itself or simply replacing all of the seals, gaskets, and rings?

I wouldnt say it has 0 miles on it unless you got a used block, polished/honed the inside of the cylinder walls, brand new crank, brand new pistons, bearings, etc.

Are you trying to sell the engine "with 0 miles" or are you just asking for technicalities sake? If you're selling anything I would just be honest and say what is original and what is new.